Turbomachines Quiz | Turbomachines Objective Type Questions and Answers
Questions
22
What is the formula for forces exerted by fluid on a body?
Answer: (Rate of momentum in) – (Rate of momentum out)
⭐ Make GKSeries Your Preferred Source on Google
Add GKSeries as Preferred Source
23
The radial force in rotodynamic machine, which is developed by rate of change of momentum in radial velocity, is taken care by__________.
Answer: journal bearing
24
Meridonial velocity is the resultant of _____________ components of fluid velocity.
Answer: radial and axial
25
_______________ components of fluid velocity have the responsibility of the transportation of fluid through the machine.
Answer: Radial and axial
26
In which turbine the pressure energy of water is first converted into kinetic energy by means of nozzle kept close to the runner?
Answer: Impulse turbine
27
The pressure of water is atmospheric and remains constant while passing over the runner in __________ .
Answer: Impulse turbine
28
The energy of water entering the reaction turbine is _______
Answer: partly the pressure energy and partly the kinetic energy
29
Which of the following is an example of impulse turbine?
Answer: Pelton wheel
30
The runner of __________ turbine always be under pressure of above atmospheric
Answer: Kaplan
31
The water from runner in reaction turbine is discharged into tail race through a draft tube which has ____________ cross sectional area.
Answer: gradually increasing
32
__________ turbines are also called as parallel flow turbine.
Answer: Axial flow
33
In which type of reaction turbine does the water flow in radial direction at the outer periphery of runner and leave at the centre in the direction parallel to the axis of rotation of runner?
Answer: Mixed flow turbine
34
What is the formula to calculate specific speed (Ns) of a turbine rotating at a speed of 'N' rpm that develops the power of 'P' kW at the heat of 'H' m?
Answer: (Ns) = (N √P) x (H)(5/4)
35
Generally, the value of specific speed of Kaplan turbine is _____________ that of the Pelton turbine.
Answer: higher than
36
The passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as__________
Answer: steam nozzle
37
The nozzle efficiency can be defined as the ratio of
Answer: actual enthalpy drop to isentropic enthalpy drop
38
The quality of vapour at the exit of nozzle ___________ due to nozzle friction.
Answer: increases
39
Pump transfers the mechanical energy of a motor or of an engine into _________ of a fluid.
Answer: pressure energy, kinetic energy or both
40
Which of the following is NOT a type of positive displacement pumps?
Answer: Centrifugal pump
